Maybe start by showing her how evil is hidden and protected in the "music" industry and then show her white rappers and black rappers (this way she won't think you are racist and ignore everything you would say). Then move on to how "rappers" (a ton of them are black so she'll indirectly understand the threat) treat their spouses/girlfriends. (Some) women are attracted to violent men so you will need to show her the worst: torture and death.